function hash_library() {
var _hash = '';
var _iframe;
var _iframe_name = 'hash_history_iframe';
var _initialized = false;
var _callback_function = false;
function _callback() {
if (_hash != _get_hash()) {
if (typeof (_callback_function) == 'function') {
try {
_callback_function();
} catch (e) { }
}
_hash = _get_hash();
}
}
function _initialize() {
if (!_initialized) {
_hash = _get_hash();
if (window && window.history && window.history.navigationMode) {
window.history.navigationMode = 'compatible';
}
if (window && 'onhashchange' in window) {
if (typeof window.addEventListener != 'undefined') {
window.addEventListener('hashchange', _callback, false);
}
else if (typeof window.attachEvent != 'undefined') {
window.attachEvent('onhashchange', _callback);
}
else {
window.onhashchange = _callback;
}
_initialized = true;
}
else {
if (document && document.body && document.body.firstChild && 'createElement' in document) {
_iframe = document.createElement('iframe');
if (_iframe && _iframe.style) {
_iframe.style.visibility = 'hidden';
_iframe.style.display = 'none';
_iframe.style.position = 'absolute';
_iframe.style.zIndex = '-9999';
_iframe.style.left = '0px';
_iframe.style.top = '0px';
_iframe.style.width = '1px';
_iframe.style.height = '1px';
_iframe.name = _iframe.id = _iframe_name;
_iframe = document.body.insertBefore(_iframe, document.body.firstChild);
_set_iframe(_get_hash());
_initialized = true;
}
}
}
}
}
function _get_hash() {
var ret = '';
if (!ret) {
if (window && window.location && window.location.href) {
var index = location.href.lastIndexOf('#');
if (index >= 0) {
ret = location.href.substr(index + 1);
}
}
}
if (!ret) {
if (window && window.location && window.location.hash) {
ret = window.location.hash;
}
}
if (ret) {
ret = ret.replace('#', '');
}
return ret;
}
function _set_iframe(hash) {
if (_iframe) {
if (_iframe.contentWindow && _iframe.contentWindow.document) {
_iframe.contentWindow.document.open();
_iframe.contentWindow.document.write('');
_iframe.contentWindow.document.close();
}
else if (window && window.frames[_iframe_name]) {
window.frames[_iframe_name].location = _root + 'hash_history.htm?' + hash;
}
else {
_iframe.src = _root + 'hash_history.htm?' + hash;
}
}
}
function _set_hash(hash, from_iframe) {
if (_hash != hash) {
if (window && window.location) {
_initialize();
if (_get_hash() != hash) {
window.location.hash = hash;
}
if (!from_iframe) {
_hash = hash;
_set_iframe(hash);
}
else {
_callback();
_hash = hash;
}
}
}
}
function _set_callback(callback) {
_callback_function = callback;
}
var _root = '/';
this.set_root = function(r) { _root = r; };
this.set_hash = _set_hash;
this.get_hash = _get_hash;
this.set_callback = _set_callback;
}